Deuteronomy 20:1

XX.
LAWS OF WARFARE.

(1) When thou goest out to battle — i.e., generally; not only in the immediate conquest of Canaan. Yet it may be observed that in the writings of Moses it is foreseen that the completion of the conquest will be gradual, and that Israel will have to go to battle many times before all enemies are overcome.

Horses and chariots. — The Israelitish army was chiefly, or rather entirely, composed of infantry, in most of the great victories won by them.